ascertain
Version:
0-Deps, simple, fast, for browser and node js object schema validator
706 lines (704 loc) • 42.3 kB
JavaScript
export const $keys = Symbol.for('@@keys');
export const $values = Symbol.for('@@values');
export const $strict = Symbol.for('@@strict');
const $op = Symbol.for('@@op');
const OR = Symbol.for('@@or');
const AND = Symbol.for('@@and');
const OPTIONAL = Symbol.for('@@optional');
const TUPLE = Symbol.for('@@tuple');
const DISCRIMINATED = Symbol.for('@@discriminated');
const CHECK = Symbol.for('@@check');
const OrCtor = function(schemas) {
this.schemas = schemas;
};
OrCtor.prototype[$op] = OR;
const AndCtor = function(schemas) {
this.schemas = schemas;
};
AndCtor.prototype[$op] = AND;
const OptionalCtor = function(schema) {
this.schemas = [
schema
];
};
OptionalCtor.prototype[$op] = OPTIONAL;
const TupleCtor = function(schemas) {
this.schemas = schemas;
};
TupleCtor.prototype[$op] = TUPLE;
const DiscriminatedCtor = function(schemas, key) {
this.schemas = schemas;
this.key = key;
};
DiscriminatedCtor.prototype[$op] = DISCRIMINATED;
const CheckCtor = function(compileFn) {
this.compile = compileFn;
};
CheckCtor.prototype[$op] = CHECK;
export const or = (...schemas)=>{
if (schemas.length === 0) throw new TypeError('Operator requires at least one schema');
return new OrCtor(schemas);
};
export const and = (...schemas)=>{
if (schemas.length === 0) throw new TypeError('Operator requires at least one schema');
return new AndCtor(schemas);
};
export const optional = (schema)=>new OptionalCtor(schema);
export const tuple = (...schemas)=>{
if (schemas.length === 0) throw new TypeError('Operator requires at least one schema');
return new TupleCtor(schemas);
};
export const discriminated = (schemas, key)=>{
if (schemas.length === 0) throw new TypeError('discriminated requires at least one schema');
return new DiscriminatedCtor(schemas, key);
};
export const check = (fnOrOpts, message)=>{
if (typeof fnOrOpts === 'function') {
return new CheckCtor((v, ctx)=>{
const fnRef = ctx.ref(fnOrOpts);
return {
check: `!${fnRef}(${v})`,
message: message ? JSON.stringify(message) : `\`check failed for value \${${v}}\``
};
});
}
return new CheckCtor(fnOrOpts.compile);
};
export const min = (n, message)=>new CheckCtor((v)=>({
check: `${v} < ${n}`,
message: message ? JSON.stringify(message) : `\`must be >= ${n}, got \${${v}}\``
}));
export const max = (n, message)=>new CheckCtor((v)=>({
check: `${v} > ${n}`,
message: message ? JSON.stringify(message) : `\`must be <= ${n}, got \${${v}}\``
}));
export const integer = (message)=>new CheckCtor((v)=>({
check: `!Number.isInteger(${v})`,
message: message ? JSON.stringify(message) : `\`must be an integer, got \${${v}}\``
}));
export const minLength = (n, message)=>new CheckCtor((v)=>({
check: `${v}.length < ${n}`,
message: message ? JSON.stringify(message) : `\`length must be >= ${n}, got \${${v}.length}\``
}));
export const maxLength = (n, message)=>new CheckCtor((v)=>({
check: `${v}.length > ${n}`,
message: message ? JSON.stringify(message) : `\`length must be <= ${n}, got \${${v}.length}\``
}));
export const gt = (n, message)=>new CheckCtor((v)=>({
check: `${v} <= ${n}`,
message: message ? JSON.stringify(message) : `\`must be > ${n}, got \${${v}}\``
}));
export const lt = (n, message)=>new CheckCtor((v)=>({
check: `${v} >= ${n}`,
message: message ? JSON.stringify(message) : `\`must be < ${n}, got \${${v}}\``
}));
export const multipleOf = (n, message)=>new CheckCtor((v)=>({
check: `${v} % ${n} !== 0`,
message: message ? JSON.stringify(message) : `\`must be a multiple of ${n}, got \${${v}}\``
}));
export const uniqueItems = (message)=>new CheckCtor((v)=>({
check: `new Set(${v}).size !== ${v}.length`,
message: message ? JSON.stringify(message) : `\`must have unique items\``
}));
export const oneOf = (values, message)=>{
const set = new Set(Array.isArray(values) ? values : Object.values(values));
return new CheckCtor((v, ctx)=>({
check: `!${ctx.ref(set)}.has(${v})`,
message: message ? JSON.stringify(message) : `\`must be one of [${[
...set
].map(toLiteral).join(', ')}], got \${${v}}\``
}));
};
export const fromBase64 = typeof Buffer === 'undefined' ? (value)=>atob(value) : (value)=>Buffer.from(value, 'base64').toString('utf-8');
const MULTIPLIERS = {
ms: 1,
s: 1000,
m: 60000,
h: 3600000,
d: 86400000,
w: 604800000
};
const TIME_REGEX = /^(\d*\.?\d*)(ms|s|m|h|d|w)?$/;
export const asError = (message)=>new TypeError(message);
export const as = {
string: (value)=>{
return typeof value === 'string' ? value : asError(`Invalid value "${value}", expected a string`);
},
number: (value)=>{
if (typeof value !== 'string') {
return asError(`Invalid value ${value}, expected a valid number`);
}
const start = value[0] === '-' || value[0] === '+' ? 1 : 0;
const c0 = value.charCodeAt(start);
const c1 = value.charCodeAt(start + 1) | 32;
if (c0 === 48 && (c1 === 120 || c1 === 111 || c1 === 98)) {
const result = Number(start ? value.slice(1) : value);
if (Number.isNaN(result)) return asError(`Invalid value ${value}, expected a valid number`);
return value[0] === '-' ? -result : result;
}
const result = value.trim() ? Number(value) : NaN;
return Number.isNaN(result) ? asError(`Invalid value ${value}, expected a valid number`) : result;
},
date: (value)=>{
const result = Date.parse(value);
const date = new Date(result);
return Number.isNaN(date.valueOf()) ? asError(`Invalid value "${value}", expected a valid date format`) : date;
},
time: (value, conversionFactor = 1)=>{
if (!value) return asError(`Invalid value ${value}, expected a valid time format`);
const matches = value.match(TIME_REGEX);
if (!matches) return asError(`Invalid value ${value}, expected a valid time format`);
const [, amount, unit = 'ms'] = matches;
const multiplier = MULTIPLIERS[unit];
const parsed = parseFloat(amount);
if (!multiplier || Number.isNaN(parsed)) {
return asError(`Invalid value ${value}, expected a valid time format`);
}
return Math.floor(parsed * multiplier / conversionFactor);
},
boolean: (value)=>/^(0|1|true|false|enabled|disabled)$/i.test(value) ? /^(1|true|enabled)$/i.test(value) : asError(`Invalid value ${value}, expected a boolean like`),
array: (value, delimiter)=>value?.split?.(delimiter) ?? asError(`Invalid value ${value}, expected an array`),
json: (value)=>{
try {
return JSON.parse(value);
} catch {
return asError(`Invalid value ${value}, expected a valid JSON string`);
}
},
base64: (value)=>{
try {
return fromBase64(value);
} catch {
return asError(`Invalid value ${value}, expected a valid base64 string`);
}
}
};
const DATETIME_RE = /^\d{4}-[01]\d-[0-3]\d[t\s](?:[0-2]\d:[0-5]\d:[0-5]\d|23:59:60)(?:\.\d+)?(?:z|[+-]\d{2}(?::?\d{2})?)$/i;
const TIME_FMT_RE = /^(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d|23:59:60)(?:\.\d+)?(?:z|[+-]\d{2}(?::?\d{2})?)$/i;
const DURATION_RE = /^P(?!$)(\d+Y)?(\d+M)?(\d+W)?(\d+D)?(T(?=\d)(\d+H)?(\d+M)?(\d+S)?)?$/;
const EMAIL_RE = /^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i;
const IDN_EMAIL_RE = /^[a-z0-9!#$%&'*+/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF-]+)*@(?:[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF](?:[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF-]*[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])?\.)+[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF](?:[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF-]*[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])?$/i;
const HOSTNAME_RE = /^(?=.{1,253}\.?$)[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?)*\.?$/i;
const IDN_HOSTNAME_RE = /^(?=.{1,253}\.?$)[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF](?:[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF-]{0,61}[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])?(?:\.[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF](?:[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF-]{0,61}[a-z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])?)*\.?$/i;
const IPV4_RE = /^(?:(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)\.){3}(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)$/;
const IPV6_RE = /^((([0-9a-f]{1,4}:){7}([0-9a-f]{1,4}|:))|(([0-9a-f]{1,4}:){6}(:[0-9a-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9a-f]{1,4}:){5}(((:[0-9a-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9a-f]{1,4}:){4}(((:[0-9a-f]{1,4}){1,3})|((:[0-9a-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9a-f]{1,4}:){3}(((:[0-9a-f]{1,4}){1,4})|((:[0-9a-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9a-f]{1,4}:){2}(((:[0-9a-f]{1,4}){1,5})|((:[0-9a-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9a-f]{1,4}:){1}(((:[0-9a-f]{1,4}){1,6})|((:[0-9a-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9a-f]{1,4}){1,7})|((:[0-9a-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?$/i;
const URI_RE = /^(?:[a-z][a-z0-9+\-.]*:)(?:\/?\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:]|%[0-9a-f]{2})*@)?(?:\[(?:(?:(?:(?:[0-9a-f]{1,4}:){6}|::(?:[0-9a-f]{1,4}:){5}|(?:[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){4}|(?:(?:[0-9a-f]{1,4}:){0,1}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){3}|(?:(?:[0-9a-f]{1,4}:){0,2}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){2}|(?:(?:[0-9a-f]{1,4}:){0,3}[0-9a-f]{1,4})?::[0-9a-f]{1,4}:|(?:(?:[0-9a-f]{1,4}:){0,4}[0-9a-f]{1,4})?::)(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?))|(?:(?:[0-9a-f]{1,4}:){0,5}[0-9a-f]{1,4})?::[0-9a-f]{1,4}|(?:(?:[0-9a-f]{1,4}:){0,6}[0-9a-f]{1,4})?::)|[Vv][0-9a-f]+\.[a-z0-9\-._~!$&'()*+,;=:]+)\]|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)|(?:[a-z0-9\-._~!$&'()*+,;=]|%[0-9a-f]{2})*)(?::\d*)?(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})*)*|\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})*)*)?|(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})*)*)(?:\?(?:[a-z0-9\-._~!$&'()*+,;=:@/?]|%[0-9a-f]{2})*)?(?:#(?:[a-z0-9\-._~!$&'()*+,;=:@/?]|%[0-9a-f]{2})*)?$/i;
const isUriRef = (s)=>URI_RE.test(s) || /^[a-z0-9\-._~:/?#\[\]@!$&'()*+,;=%]*$/i.test(s);
const IRI_RE = /^(?:[a-z][a-z0-9+\-.]*:)(?:\/?\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*@)?(?:\[(?:(?:(?:(?:[0-9a-f]{1,4}:){6}|::(?:[0-9a-f]{1,4}:){5}|(?:[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){4}|(?:(?:[0-9a-f]{1,4}:){0,1}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){3}|(?:(?:[0-9a-f]{1,4}:){0,2}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){2}|(?:(?:[0-9a-f]{1,4}:){0,3}[0-9a-f]{1,4})?::[0-9a-f]{1,4}:|(?:(?:[0-9a-f]{1,4}:){0,4}[0-9a-f]{1,4})?::)(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?))|(?:(?:[0-9a-f]{1,4}:){0,5}[0-9a-f]{1,4})?::[0-9a-f]{1,4}|(?:(?:[0-9a-f]{1,4}:){0,6}[0-9a-f]{1,4})?::)|[Vv][0-9a-f]+\.[a-z0-9\-._~!$&'()*+,;=:]+)\]|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)|(?:[a-z0-9\-._~!$&'()*+,;=\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*)(?::\d*)?(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*)*|\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:@\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*)*)?|(?:[a-z0-9\-._~!$&'()*+,;=:@\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*)*)(?:\?(?:[a-z0-9\-._~!$&'()*+,;=:@/?\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*)?(?:#(?:[a-z0-9\-._~!$&'()*+,;=:@/?\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|%[0-9a-f]{2})*)?$/i;
const isIriRef = (s)=>IRI_RE.test(s) || /^[a-z0-9\-._~:/?#\[\]@!$&'()*+,;=\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF%]*$/i.test(s);
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
const URI_TEMPLATE_RE = /^(?:(?:[^\x00-\x20"'<>%\\^`{|}]|%[0-9a-f]{2})|\{[+#./;?&=,!@|]?(?:[a-z0-9_]|%[0-9a-f]{2})+(?::[1-9][0-9]{0,3}|\*)?(?:,(?:[a-z0-9_]|%[0-9a-f]{2})+(?::[1-9][0-9]{0,3}|\*)?)*\})*$/i;
const JSON_POINTER_RE = /^(?:\/(?:[^~/]|~0|~1)*)*$/;
const REL_JSON_POINTER_RE = /^(?:0|[1-9][0-9]*)(?:#|(?:\/(?:[^~/]|~0|~1)*)*)$/;
const DAYS = [
0,
31,
28,
31,
30,
31,
30,
31,
31,
30,
31,
30,
31
];
const isValidDate = (s)=>{
const m = /^\d{4}-(\d{2})-(\d{2})$/.exec(s);
if (!m) return false;
const month = +m[1], day = +m[2];
if (month < 1 || month > 12 || day < 1) return false;
if (month === 2) {
const y = +s.slice(0, 4);
return day <= (y % 4 === 0 && (y % 100 !== 0 || y % 400 === 0) ? 29 : 28);
}
return day <= DAYS[month];
};
const isValidRegex = (s)=>{
try {
new RegExp(s);
return true;
} catch {
return false;
}
};
const regexFormat = (re, name, message)=>new CheckCtor((v, ctx)=>({
check: `!${ctx.ref(re)}.test(${v})`,
message: message ? JSON.stringify(message) : `\`must be a valid ${name}, got \${${v}}\``
}));
const fnFormat = (fn, name, message)=>new CheckCtor((v, ctx)=>({
check: `!${ctx.ref(fn)}(${v})`,
message: message ? JSON.stringify(message) : `\`must be a valid ${name}, got \${${v}}\``
}));
export const format = {
dateTime: (message)=>regexFormat(DATETIME_RE, 'date-time', message),
date: (message)=>fnFormat(isValidDate, 'date', message),
time: (message)=>regexFormat(TIME_FMT_RE, 'time', message),
duration: (message)=>regexFormat(DURATION_RE, 'duration', message),
email: (message)=>regexFormat(EMAIL_RE, 'email', message),
idnEmail: (message)=>regexFormat(IDN_EMAIL_RE, 'idn-email', message),
hostname: (message)=>regexFormat(HOSTNAME_RE, 'hostname', message),
idnHostname: (message)=>regexFormat(IDN_HOSTNAME_RE, 'idn-hostname', message),
ipv4: (message)=>regexFormat(IPV4_RE, 'ipv4', message),
ipv6: (message)=>regexFormat(IPV6_RE, 'ipv6', message),
uri: (message)=>regexFormat(URI_RE, 'uri', message),
uriReference: (message)=>fnFormat(isUriRef, 'uri-reference', message),
iri: (message)=>regexFormat(IRI_RE, 'iri', message),
iriReference: (message)=>fnFormat(isIriRef, 'iri-reference', message),
uuid: (message)=>regexFormat(UUID_RE, 'uuid', message),
uriTemplate: (message)=>regexFormat(URI_TEMPLATE_RE, 'uri-template', message),
jsonPointer: (message)=>regexFormat(JSON_POINTER_RE, 'json-pointer', message),
relativeJsonPointer: (message)=>regexFormat(REL_JSON_POINTER_RE, 'relative-json-pointer', message),
regex: (message)=>fnFormat(isValidRegex, 'regex', message)
};
class Context {
registry = [];
lookupMap = new Map();
varIndex = 0;
register(value) {
const index = this.lookupMap.get(value);
if (index !== undefined) {
return index;
}
{
const index = this.registry.push(value) - 1;
this.lookupMap.set(value, index);
return index;
}
}
unique(prefix) {
return `${prefix}$$${this.varIndex++}`;
}
}
const isTagged = (schema)=>schema?.[$op] !== undefined;
const childMode = (mode, key)=>{
if (typeof key === 'object' && 'dynamic' in key) {
return {
fast: false,
firstError: mode.firstError,
issues: mode.issues,
path: mode.path,
pathExpr: `[${mode.path.map((k)=>JSON.stringify(k)).join(',')}${mode.path.length ? ',' : ''}${key.dynamic}]`
};
}
const newPath = [
...mode.path,
key
];
return {
fast: false,
firstError: mode.firstError,
issues: mode.issues,
path: newPath,
pathExpr: JSON.stringify(newPath)
};
};
const toLiteral = (value)=>typeof value === 'bigint' ? `${value}n` : JSON.stringify(value);
const codeGen = (schema, context, valuePath, mode)=>{
const emit = mode.fast ? null : mode.firstError ? (msg)=>`${mode.issues} = [{ message: ${msg}, path: ${mode.pathExpr} }]; return ${mode.issues};` : (msg)=>`(${mode.issues} || (${mode.issues} = [])).push({ message: ${msg}, path: ${mode.pathExpr} });`;
const fail = mode.fast ? mode.onFail ?? 'return false;' : '';
if (isTagged(schema)) {
const tag = schema[$op];
if (tag === AND) {
const valueAlias = context.unique('v');
const code = schema.schemas.map((s)=>codeGen(s, context, valueAlias, mode)).join('\n');
return `const ${valueAlias} = ${valuePath};\n${code}`;
} else if (tag === OR) {
const valueAlias = context.unique('v');
const foundValid = context.unique('valid');
if (mode.fast) {
const branches = schema.schemas.map((s)=>{
const branchValid = context.unique('valid');
const branchCode = codeGen(s, context, valueAlias, {
...mode,
onFail: `${branchValid} = false;`
});
return `if (!${foundValid}) { let ${branchValid} = true; ${branchCode} if (${branchValid}) { ${foundValid} = true; } }`;
});
return `const ${valueAlias} = ${valuePath};\nlet ${foundValid} = false;\n${branches.join('\n')}\nif (!${foundValid}) { ${fail} }`;
} else if (mode.firstError) {
const firstBranchIssues = context.unique('iss');
const branches = schema.schemas.map((s, idx)=>{
const branchIssues = context.unique('iss');
const branchCode = codeGen(s, context, valueAlias, {
fast: false,
firstError: true,
issues: branchIssues,
path: mode.path,
pathExpr: mode.pathExpr
}).replace(new RegExp(`; return ${branchIssues};`, 'g'), ';');
if (idx === 0) {
return `if (!${foundValid}) { let ${branchIssues}; ${branchCode} if (!${branchIssues}) { ${foundValid} = true; } else { ${firstBranchIssues} = ${branchIssues}; } }`;
}
return `if (!${foundValid}) { let ${branchIssues}; ${branchCode} if (!${branchIssues}) { ${foundValid} = true; } }`;
});
return `const ${valueAlias} = ${valuePath};\nlet ${firstBranchIssues};\nlet ${foundValid} = false;\n${branches.join('\n')}\nif (!${foundValid}) { return ${firstBranchIssues}; }`;
} else {
const localIssues = context.unique('iss');
const branches = schema.schemas.map((s)=>{
const branchIssues = context.unique('iss');
const branchCode = codeGen(s, context, valueAlias, {
fast: false,
firstError: false,
issues: branchIssues,
path: mode.path,
pathExpr: mode.pathExpr
});
return `if (!${foundValid}) { let ${branchIssues}; ${branchCode} if (!${branchIssues}) { ${foundValid} = true; } else { ${localIssues}.push(...${branchIssues}); } }`;
});
return `const ${valueAlias} = ${valuePath};\nconst ${localIssues} = [];\nlet ${foundValid} = false;\n${branches.join('\n')}\nif (!${foundValid}) { (${mode.issues} || (${mode.issues} = [])).push(...${localIssues}); }`;
}
} else if (tag === OPTIONAL) {
const valueAlias = context.unique('v');
return `const ${valueAlias} = ${valuePath};\nif (${valueAlias} !== undefined && ${valueAlias} !== null) { ${codeGen(schema.schemas[0], context, valueAlias, mode)} }`;
} else if (tag === TUPLE) {
const valueAlias = context.unique('v');
if (mode.fast) {
return `const ${valueAlias} = ${valuePath};\nif (${valueAlias} === null || typeof ${valueAlias} !== 'object' || !Array.isArray(${valueAlias}) || ${valueAlias}.length !== ${schema.schemas.length}) { ${fail} }\n${schema.schemas.map((s, idx)=>codeGen(s, context, `${valueAlias}[${idx}]`, mode)).join('\n')}`;
} else {
return [
`const ${valueAlias} = ${valuePath};`,
`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`,
`else if (typeof ${valueAlias} !== 'object') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected an instance of Array\``)} }`,
`else if (!Array.isArray(${valueAlias})) { ${emit(`\`Invalid instance of \${${valueAlias}.constructor?.name}, expected an instance of Array\``)} }`,
`else if (${valueAlias}.length !== ${schema.schemas.length}) { ${emit(`\`Invalid tuple length \${${valueAlias}.length}, expected ${schema.schemas.length}\``)} }`,
`else { ${schema.schemas.map((s, idx)=>codeGen(s, context, `${valueAlias}[${idx}]`, childMode(mode, idx))).join('\n')} }`
].join('\n');
}
} else if (tag === CHECK) {
const valueAlias = context.unique('v');
const ref = (v)=>`ctx.registry[${context.register(v)}]`;
const { check: cond, message } = schema.compile(valueAlias, {
ref
});
if (mode.fast) {
return `const ${valueAlias} = ${valuePath};\nif (${cond}) { ${fail} }`;
}
return `const ${valueAlias} = ${valuePath};\nif (${cond}) { ${emit(message)} }`;
} else {
const { key, schemas } = schema;
const valueAlias = context.unique('v');
const discriminantAlias = context.unique('d');
const keyStr = JSON.stringify(key);
const variants = [];
for (const s of schemas){
if (typeof s !== 'object' || s === null || !(key in s)) {
throw new TypeError(`discriminated: each schema must have the discriminant key "${key}"`);
}
const discriminantValue = s[key];
if (typeof discriminantValue !== 'string' && typeof discriminantValue !== 'number' && typeof discriminantValue !== 'boolean') {
throw new TypeError(`discriminated: discriminant value must be a string, number, or boolean literal`);
}
variants.push({
value: discriminantValue,
schema: s
});
}
if (mode.fast) {
const branches = variants.map(({ value, schema: s })=>{
const branchCode = codeGen(s, context, valueAlias, mode);
return `if (${discriminantAlias} === ${JSON.stringify(value)}) { ${branchCode} }`;
});
return [
`const ${valueAlias} = ${valuePath};`,
`if (${valueAlias} === null || ${valueAlias} === undefined || typeof ${valueAlias} !== 'object' || ${valueAlias} instanceof Error) { ${fail} }`,
`const ${discriminantAlias} = ${valueAlias}[${keyStr}];`,
branches.join(' else ') + ` else { ${fail} }`
].join('\n');
} else {
const validValues = variants.map((v)=>JSON.stringify(v.value)).join(', ');
const branches = variants.map(({ value, schema: s })=>{
const branchCode = codeGen(s, context, valueAlias, mode);
return `if (${discriminantAlias} === ${JSON.stringify(value)}) { ${branchCode} }`;
});
return [
`const ${valueAlias} = ${valuePath};`,
`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`,
`else if (typeof ${valueAlias} !== 'object') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected an object\``)} }`,
`else if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }`,
`else {`,
` const ${discriminantAlias} = ${valueAlias}[${keyStr}];`,
` ${branches.join(' else ')} else { ${emit(`\`Invalid discriminant value \${JSON.stringify(${discriminantAlias})}, expected one of: ${validValues}\``)} }`,
`}`
].join('\n');
}
}
}
if (typeof schema === 'function') {
const valueAlias = context.unique('v');
const name = schema?.name;
const s = schema;
const primitiveType = s === String ? 'string' : s === Number ? 'number' : s === Boolean ? 'boolean' : s === BigInt ? 'bigint' : s === Symbol ? 'symbol' : null;
if (mode.fast) {
if (primitiveType) {
const checks = [
`typeof ${valueAlias} !== '${primitiveType}'`
];
if (primitiveType === 'number') checks.push(`Number.isNaN(${valueAlias})`);
return `const ${valueAlias} = ${valuePath};\nif (${checks.join(' || ')}) { ${fail} }`;
} else if (name === 'Function') {
return `const ${valueAlias} = ${valuePath};\nif (typeof ${valueAlias} !== 'function') { ${fail} }`;
} else {
const isError = schema === Error || schema?.prototype instanceof Error;
const index = context.register(schema);
const registryAlias = context.unique('r');
return `const ${valueAlias} = ${valuePath};\nconst ${registryAlias} = ctx.registry[${index}];\nif (${valueAlias} === null || ${valueAlias} === undefined${isError ? '' : ` || ${valueAlias} instanceof Error`} || (typeof ${valueAlias} === 'object' && !(${valueAlias} instanceof ${registryAlias})) || (typeof ${valueAlias} !== 'object' && ${valueAlias}?.constructor !== ${registryAlias}) || Number.isNaN(${valueAlias}?.valueOf?.())) { ${fail} }`;
}
} else {
const code = [
`const ${valueAlias} = ${valuePath};`
];
if (primitiveType) {
code.push(`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`);
code.push(`else if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }`);
code.push(`else if (typeof ${valueAlias} !== '${primitiveType}') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected type ${name}\``)} }`);
if (primitiveType === 'number') code.push(`else if (Number.isNaN(${valueAlias})) { ${emit(`\`Invalid value \${${valueAlias}}, expected a valid ${name}\``)} }`);
} else if (name === 'Function') {
code.push(`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`);
code.push(`else if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }`);
code.push(`else if (typeof ${valueAlias} !== 'function') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected type Function\``)} }`);
} else {
const isError = schema === Error || schema?.prototype instanceof Error;
const index = context.register(schema);
const registryAlias = context.unique('r');
code.push(`const ${registryAlias} = ctx.registry[${index}];`);
code.push(`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`);
if (!isError) code.push(`else if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }`);
code.push(`else if (typeof ${valueAlias} === 'object' && !(${valueAlias} instanceof ${registryAlias})) { ${emit(`\`Invalid instance of \${${valueAlias}?.constructor?.name}, expected an instance of ${name}\``)} }`);
code.push(`else if (typeof ${valueAlias} !== 'object' && ${valueAlias}?.constructor !== ${registryAlias}) { ${emit(`\`Invalid type \${${valueAlias}?.constructor?.name}, expected type ${name}\``)} }`);
code.push(`else if (Number.isNaN(${valueAlias}?.valueOf?.())) { ${emit(`\`Invalid value \${${valueAlias}}, expected a valid ${name}\``)} }`);
}
return code.join('\n');
}
}
if (Array.isArray(schema)) {
const valueAlias = context.unique('v');
if (mode.fast) {
let code = `const ${valueAlias} = ${valuePath};\nif (!Array.isArray(${valueAlias})) { ${fail} }`;
if (schema.length === 1) {
const value = context.unique('val');
const key = context.unique('key');
code += `\nfor (let ${key} = 0; ${key} < ${valueAlias}.length; ${key}++) { const ${value} = ${valueAlias}[${key}]; ${codeGen(schema[0], context, value, mode)} }`;
} else if (schema.length > 1) {
code += `\nif (${valueAlias}.length > ${schema.length}) { ${fail} }`;
code += '\n' + schema.map((s, idx)=>codeGen(s, context, `${valueAlias}[${idx}]`, mode)).join('\n');
}
return code;
} else {
const code = [
`const ${valueAlias} = ${valuePath};`,
`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`,
`else if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }`,
`else if (typeof ${valueAlias} !== 'object') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected an instance of Array\``)} }`,
`else if (!Array.isArray(${valueAlias})) { ${emit(`\`Invalid instance of \${${valueAlias}.constructor?.name}, expected an instance of Array\``)} }`
];
if (schema.length > 0) {
const value = context.unique('val');
const key = context.unique('key');
if (schema.length === 1) {
code.push(`else { for (let ${key} = 0; ${key} < ${valueAlias}.length; ${key}++) { const ${value} = ${valueAlias}[${key}]; ${codeGen(schema[0], context, value, childMode(mode, {
dynamic: key
}))} } }`);
} else {
code.push(`else if (${valueAlias}.length > ${schema.length}) { ${emit(`\`Invalid tuple length \${${valueAlias}.length}, expected ${schema.length}\``)} }`);
code.push(`else { ${schema.map((s, idx)=>codeGen(s, context, `${valueAlias}[${idx}]`, childMode(mode, idx))).join('\n')} }`);
}
}
return code.join('\n');
}
}
if (typeof schema === 'object' && schema !== null) {
if (schema instanceof RegExp) {
const valueAlias = context.unique('v');
if (mode.fast) {
return `const ${valueAlias} = ${valuePath};\nif (${valueAlias} === null || ${valueAlias} === undefined || ${valueAlias} instanceof Error || !${schema.toString()}.test(String(${valueAlias}))) { ${fail} }`;
} else {
return `const ${valueAlias} = ${valuePath};\nif (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }\nelse if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }\nelse if (!${schema.toString()}.test(String(${valueAlias}))) { ${emit(`\`Invalid value \${${valueAlias}}, expected to match ${schema.toString()}\``)} }`;
}
} else {
const valueAlias = context.unique('v');
if (mode.fast) {
let code = `const ${valueAlias} = ${valuePath};\nif (${valueAlias} === null || typeof ${valueAlias} !== 'object' || ${valueAlias} instanceof Error) { ${fail} }`;
if ($keys in schema) {
const keysAlias = context.unique('k');
const kAlias = context.unique('k');
code += `\nconst ${keysAlias} = Object.keys(${valueAlias});\nfor (const ${kAlias} of ${keysAlias}) { ${codeGen(schema[$keys], context, kAlias, mode)} }`;
}
if ($values in schema) {
const vAlias = context.unique('val');
const kAlias = context.unique('k');
const entriesAlias = context.unique('en');
code += `\nconst ${entriesAlias} = Object.entries(${valueAlias});\nfor (const [${kAlias}, ${vAlias}] of ${entriesAlias}) { ${codeGen(schema[$values], context, vAlias, mode)} }`;
}
if ($strict in schema && schema[$strict]) {
const keysAlias = context.unique('k');
const kAlias = context.unique('k');
const extraAlias = context.unique('ex');
code += `\nconst ${keysAlias} = new Set(${JSON.stringify(Object.keys(schema))});\nconst ${extraAlias} = Object.keys(${valueAlias}).filter(${kAlias} => !${keysAlias}.has(${kAlias}));\nif (${extraAlias}.length !== 0) { ${fail} }`;
}
code += '\n' + Object.entries(schema).map(([key, s])=>codeGen(s, context, `${valueAlias}[${JSON.stringify(key)}]`, mode)).join('\n');
return code;
} else {
const code = [
`const ${valueAlias} = ${valuePath};`,
`if (${valueAlias} === null || ${valueAlias} === undefined) { ${emit(`\`Invalid value \${${valueAlias}}, expected non-nullable\``)} }`,
`else if (typeof ${valueAlias} !== 'object') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected an instance of Object\``)} }`,
`else if (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }`,
'else {'
];
const innerCode = [];
if ($keys in schema) {
const keysAlias = context.unique('k');
const kAlias = context.unique('k');
innerCode.push(`const ${keysAlias} = Object.keys(${valueAlias});`);
innerCode.push(`for (const ${kAlias} of ${keysAlias}) { ${codeGen(schema[$keys], context, kAlias, childMode(mode, {
dynamic: kAlias
}))} }`);
}
if ($values in schema) {
const vAlias = context.unique('val');
const kAlias = context.unique('k');
const entriesAlias = context.unique('en');
innerCode.push(`const ${entriesAlias} = Object.entries(${valueAlias});`);
innerCode.push(`for (const [${kAlias}, ${vAlias}] of ${entriesAlias}) { ${codeGen(schema[$values], context, vAlias, childMode(mode, {
dynamic: kAlias
}))} }`);
}
if ($strict in schema && schema[$strict]) {
const keysAlias = context.unique('k');
const kAlias = context.unique('k');
const extraAlias = context.unique('ex');
innerCode.push(`const ${keysAlias} = new Set(${JSON.stringify(Object.keys(schema))});`);
innerCode.push(`const ${extraAlias} = Object.keys(${valueAlias}).filter(${kAlias} => !${keysAlias}.has(${kAlias}));`);
innerCode.push(`if (${extraAlias}.length !== 0) { ${emit(`\`Extra properties: \${${extraAlias}}, are not allowed\``)} }`);
}
innerCode.push(...Object.entries(schema).map(([key, s])=>codeGen(s, context, `${valueAlias}[${JSON.stringify(key)}]`, childMode(mode, key))));
code.push(innerCode.join('\n'), '}');
return code.join('\n');
}
}
}
if (typeof schema === 'symbol') {
const index = context.register(schema);
const valueAlias = context.unique('v');
const registryAlias = context.unique('r');
if (mode.fast) {
return `const ${valueAlias} = ${valuePath};\nconst ${registryAlias} = ctx.registry[${index}];\nif (typeof ${valueAlias} !== 'symbol' || ${valueAlias} !== ${registryAlias}) { ${fail} }`;
} else {
return `const ${valueAlias} = ${valuePath};\nconst ${registryAlias} = ctx.registry[${index}];\nif (typeof ${valueAlias} !== 'symbol') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected symbol\``)} }\nelse if (${valueAlias} !== ${registryAlias}) { ${emit(`\`Invalid value \${${valueAlias}.toString()}, expected ${schema.toString()}\``)} }`;
}
}
if (schema === null || schema === undefined) {
const valueAlias = context.unique('v');
if (mode.fast) {
return `const ${valueAlias} = ${valuePath};\nif (${valueAlias} !== null && ${valueAlias} !== undefined) { ${fail} }`;
} else {
return `const ${valueAlias} = ${valuePath};\nif (${valueAlias} !== null && ${valueAlias} !== undefined) { ${emit(`\`Invalid value \${String(${valueAlias})}, expected nullable\``)} }`;
}
}
const valueAlias = context.unique('v');
if (mode.fast) {
return `const ${valueAlias} = ${valuePath};\nif (typeof ${valueAlias} !== '${typeof schema}' || ${valueAlias} !== ${toLiteral(schema)}) { ${fail} }`;
} else {
const value = context.unique('val');
return `const ${valueAlias} = ${valuePath};\nconst ${value} = ${toLiteral(schema)};\nif (${valueAlias} instanceof Error) { ${emit(`\`\${${valueAlias}.message}\``)} }\nelse if (typeof ${valueAlias} !== '${typeof schema}') { ${emit(`\`Invalid type \${typeof ${valueAlias}}, expected ${typeof schema}\``)} }\nelse if (${valueAlias} !== ${value}) { ${emit(`\`Invalid value \${String(${valueAlias})}, expected ${toLiteral(schema)}\``)} }`;
}
};
const emptyIssues = [];
export const compile = (schema, options)=>{
const allErrors = options?.allErrors ?? false;
if (allErrors) {
const fastContext = new Context();
const fastCode = `${codeGen(schema, fastContext, 'data', {
fast: true
})}\nreturn true;`;
const fastValidator = new Function('ctx', `return (data) => {\n${fastCode}\n};`)(fastContext);
const issueContext = new Context();
const issueCode = `let issues;\n${codeGen(schema, issueContext, 'data', {
fast: false,
firstError: false,
issues: 'issues',
path: [],
pathExpr: '[]'
})}\nreturn issues || [];`;
const issueValidator = new Function('ctx', `return (data) => {\n${issueCode}\n};`)(issueContext);
const validator = (data)=>{
if (fastValidator(data)) {
return true;
}
validator.issues = issueValidator(data);
return false;
};
validator.issues = emptyIssues;
return validator;
}
const fastContext = new Context();
const fastCode = `${codeGen(schema, fastContext, 'data', {
fast: true
})}\nreturn true;`;
const fastValidator = new Function('ctx', `return (data) => {\n${fastCode}\n};`)(fastContext);
const context = new Context();
const code = codeGen(schema, context, 'data', {
fast: false,
firstError: true,
issues: 'issues',
path: [],
pathExpr: '[]'
});
const firstErrorValidator = new Function('ctx', `return (data) => {\nlet issues;\n${code}\nreturn issues;\n};`)(context);
const validator = (data)=>{
if (fastValidator(data)) {
return true;
}
validator.issues = firstErrorValidator(data);
return false;
};
validator.issues = emptyIssues;
return validator;
};
export const ascertain = (schema, data)=>{
const validator = compile(schema);
if (!validator(data)) {
throw new TypeError(validator.issues[0].message, {
cause: {
issues: validator.issues
}
});
}
};
export const createValidator = (config)=>{
return (schema)=>{
ascertain(schema, config);
return config;
};
};
export const standardSchema = (schema)=>{
const validator = compile(schema);
const fn = (data)=>{
if (!validator(data)) {
throw new TypeError(validator.issues[0].message, {
cause: {
issues: validator.issues
}
});
}
};
fn['~standard'] = {
version: 1,
vendor: 'ascertain',
validate: (value)=>{
if (validator(value)) {
return {
value: value
};
}
return {
issues: validator.issues
};
}
};
return fn;
};
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